in journalctl i found: modprobe: FATAL: Module dm-snapshot not found ... Can't process LV root_snap: snapshot target support missing from kernel Zitat von Tru Huynh <tru at centos.org>: > On Wed, Dec 02, 2015 at 08:53:39PM +0100, Axel Glienke wrote: >> Creating snapshot: >> >> [root at lvmtest ~]# lvcreate -L5G -s -n root_snap /dev/centos/root >> Reducing COW size 5,00 GiB down to maximum usable size 2,94 GiB. >> Logical volume "root_snap" created. >> [root at lvmtest ~]# lvs >> LV VG Attr LSize Pool Origin Data% Meta% Move >> Log Cpy%Sync Convert >> root centos owi-aos--- 2,93g >> root_snap centos swi-a-s--- 2,94g root 0,00 >> swap centos -wi-ao---- 1,00g >> >> --- reboot --- >> >> dracut shell (missing /dev/centos/root) >> >> cat proc/cmdline: >> BOOT_IMAGE=/vmlinuz-3.10.0-229.20.1.el7.x86_64 >> root=/dev/mapper/centos_root ro rd.lvm.lv=centos/root >> rd.lvm.lv=centos/swap crashkernel=auto rhgb quiet LANG=de_DE.UTF-8 >> systemd.debug > > shouldn't you have a new grub entry with: > root=/dev/mapper/root_snap rd.lvm.lv=centos/root_snap > > Tru > > -- > Tru Huynh > http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBEFA581B Grüße Axel